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bst_vs_heap_vs_hashmap.cpp
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bst_vs_heap_vs_hashmap.cpp
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// https://cirosantilli.com/linux-kernel-module-cheat#bst-vs-heap-vs-hashmap
#include <algorithm>
#include <cassert>
#include <chrono>
#include <iostream>
#include <queue>
#include <random>
#include <set>
#include <unordered_set>
#include <lkmc/m5ops.h>
int main(int argc, char **argv) {
typedef uint64_t I;
std::vector<I> randoms;
size_t i, j, n, granule, base;
std::priority_queue<I> heap;
std::set<I> bst;
std::unordered_set<I> hashmap;
unsigned int seed = std::random_device()();
// CLI arguments.
if (argc > 1) {
n = std::stoi(argv[1]);
} else {
n = 10;
}
#ifdef LKMC_M5OPS_ENABLE
// Let's comment useless stuff out to speed up gem5 simulations.
granule = 1;
j = 0;
#else
if (argc > 2) {
granule = std::stoi(argv[2]);
} else {
granule = 1;
}
#endif
// Action.
for (i = 0; i < n; ++i) {
randoms.push_back(i);
}
std::shuffle(randoms.begin(), randoms.end(), std::mt19937(seed));
for (i = 0; i < n / granule; ++i) {
#ifndef LKMC_M5OPS_ENABLE
using clk = std::chrono::high_resolution_clock;
decltype(clk::now()) start, end;
#endif
base = i * granule;
// Heap.
#ifndef LKMC_M5OPS_ENABLE
start = clk::now();
for (j = 0; j < granule; ++j) {
#endif
LKMC_M5OPS_RESETSTATS;
heap.emplace(randoms[base + j]);
LKMC_M5OPS_DUMPSTATS;
#ifndef LKMC_M5OPS_ENABLE
}
end = clk::now();
auto dt_heap = (end - start) / granule;
#endif
// BST.
#ifndef LKMC_M5OPS_ENABLE
start = clk::now();
for (j = 0; j < granule; ++j) {
#endif
LKMC_M5OPS_RESETSTATS;
bst.insert(randoms[base + j]);
LKMC_M5OPS_DUMPSTATS;
#ifndef LKMC_M5OPS_ENABLE
}
end = clk::now();
auto dt_bst = (end - start) / granule;
#endif
// Hashmap.
#ifndef LKMC_M5OPS_ENABLE
start = clk::now();
for (j = 0; j < granule; ++j) {
#endif
LKMC_M5OPS_RESETSTATS;
hashmap.insert(randoms[base + j]);
LKMC_M5OPS_DUMPSTATS;
#ifndef LKMC_M5OPS_ENABLE
}
end = clk::now();
auto dt_hashmap = (end - start) / granule;
#endif
#ifndef LKMC_M5OPS_ENABLE
// Output.
std::cout
<< base << " "
<< std::chrono::duration_cast<std::chrono::nanoseconds>(dt_heap).count() << " "
<< std::chrono::duration_cast<std::chrono::nanoseconds>(dt_bst).count() << " "
<< std::chrono::duration_cast<std::chrono::nanoseconds>(dt_hashmap).count() << std::endl
;
#endif
}
// Sanity check.
for (auto it = bst.rbegin(); it != bst.rend(); ++it) {
assert(*it == heap.top());
heap.pop();
}
}